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Yes... If you was an teamspeak addon developer (not author, DEVELOPER) before this badge came, then you had to update your teamspeak 3 plugin to the latest QT and SDK (23) which is compatible with the 3.3+ client.

edit (added more):

I've checked your myTeamspeak page and detected your add-ons, so that means that you can't get this badge anymore: It was for plugin developers who have uploaded a plugin before this date: 14.06.2019